docs: def get(self, file_id: Union[str, bson.ObjectId]) -> [typing.BinaryIO, str, datetime.datetime]:
          """
          Return the file identified by a file_id string.
  
          The return value is a file-like object which also has the following attributes:
          filename: str
          upload_date: datetime
          """
          if isinstance(file_id, str):
              file_id = bson.ObjectId(file_id)
          file = self._fs.get(file_id)
          return file, file.filename, file.upload_date